. >> nasa now thinks that mars once capable of supporting a very simple life forms. the discovery was made by the mars rover, which arrived on the red play back in august. kron fours charles clifford has more. >> they are using the instruments to drill into march and rocks and analyze the results. >> what they found it so far, nitrogen, hydrogen, phosphorus. >> they also found mineral clay. this in the case in the distant past probably millions of years ago this area was covered in water. >> the water was probably fresh, not too salty or acidic. that means that microbial life could have survived. >> this was an ancient environment with the right elements. minerals indicating a near neutral environment and slightly salty liquid water. >> ha all of the prerequisites to support life. >> these discoveries mean that life may have existed eons ago but as of yet scientists have not found any actual signs of life forms microbial or otherwise. >> charles clifford kron 4 news. >> the san francisco 49ers free agent to go is tight end delanie walker who signs a four year, $17.5